Abstract
The magnetic field dependence of the electronic density of states at the Fermi level, , is determined in single-crystal Y by specific heat measurements. The total specific heat is best described by including two predictions for the electronic specific heat of -wave superconductivity: a term in zero field and an increased linear term in a magnetic field applied perpendicular to the Cu planes. The additional linear term, which implies a finite , obeys as predicted by Volovik for superconductivity with lines of nodes in the gap.
- Received 14 June 1994
DOI:https://doi.org/10.1103/PhysRevLett.73.2744
©1994 American Physical Society